Sandpaper and rubbing machine



Nov. 23 1926. 1,608,262

L. FERRARA SANDPAPER AND RUBBING MACHINE Filed August 15, 1924 INVENTOR 580ml: crmru Patented Nev. 23, 1926.

LOUIS FEBBARA, OF MASEE'TIH-f NEWYORK.

1,608,262 "erarcie.

SANDPAPER WLA NI) BUB-BING- IflCACHINE.

'aApplica-tion filedAugust 15,=1824. Scrial 110;?32165.

. invention having for an objectthe provision of a novel machine of this sort which is readily manipulable byhand and'in which --tl1e active operative elementis in the-form.

of a reciprocable device.

For further compreheiisron of the invention, and of the objects rand -advantages thereof, reference will be-hadto the'follow- .ing description. and accompanying:drawing, and to the appended claims in which the various-novel featuresof the'inventio-n are more particularly set forth.

Fig. '1 (state drawing is aside view-ofmy improved sandpapering machine.

Fig. :2 is-an 'end-view -thereof. Fig. 3 isadetailhorizontahsectional-view .talren onthe line'3-3= of Fig. 1.

Fig. l is:=a. detail-horizontal sectional view taken 'OIi:the\-"line' 4 4l f'Fig. 1. Y

. Fig. 5:is'a fragmentary side view showing' a-sli'ghtly modified construction.

In the drawing the reference-n-umeral '10 indicates a; small electric motor of ordinary type to the casing of which'a'projecting handle 11 is attached. *Upon one-end of-the shaft '12 of the motor gear pinion 13 is fixed, this;pini0n meshing with a Lgear'l l loose on a stub shaft 15 fiXedupQ-n the end of thevmotor casing. Fi-Xed 'toithe 'face of the gear 14: eccentrically thereof,:-is aipin 16 that engages in a longitudinal slot 17 in .an'oscillatolylever 18 that is fulcrumed at its upper end to a projection from a housing 19 that is screwed onto the casing.

Upon the lower end of the lever 18 is fixed a foot 20 of rectangular shape in plan view and whose lower surface is curved concentric with the fulcrum point of the lever. Mounted in suitable bearing members 21 at opposite ends of this foot are the drums 22 over which are passed the ends of a web 23 of sandpaper, the web of paper passing under the foot from one drum to the other. The paper is locked to the foot by means of the clamping bars 25 that project across the endsof the foot and are fixed to the ends of the bars 26 slidable in bearing elements 27 in the foot, springs 28 acting to keep the clamping bars in operative. posi tion. The foot is formed with a recess 20 in which these parts are located. The inner or adjacent ends of the bars 26 are provided with transverse members 30 between :whichis'positioned a cam 31 that is lixed on the lower end of a rod 32 that extends upward through asuitable longitudinal b0ring in the-lever18 and 1s partially rotatable in the latter. This rod 32has'lixed thereto adjacent its upper end, a laterally project ing pin 34 that isadapted to engagesuitable fixed; parts when. the lever reaches each end of its-oscillatory movement-,to rockrthe rod and so momentarily free the clamping bars from the paper to permit of the latter being advanced. These fixed members-that the pin 34 engages are here in the :formof verticalshoulders 35 on the housing ltl that is =threaded on the end --.of the anotor and whichrovers the gear-Hand theu-pper'end of the -lever-18. Fixed 'to-the rod 32, just above the'foot20, is air-armed that'is adapted to engage one end-ofa thrust bar:41 slid- 7 ably mounted on top of the foot, and normally urged in =one direction by spring-4C1, thisbar hating-aspring pawl42 on its other end that bearson a ratchet wheel 43 .per-

mitted to turn in one direction only by meansof ratchet-4.3 operated byjsprin'g- 13", :saidratchet wheel being ilixed zoo-axially to one of=the drums 22. The pin 34 a=nd arm '40 are so @positioned with respect :to one another 1 that the clamping bar's 25 will be lifte'd from :the .3 paper before the thrust element 4:1' is engaged to move the-drum and advancethe paper, the bars 25 again engaging the paper after the s'aidmovement 'of'the'drum'has been completed. The mem- :ber 41 maybe suitably.guided' as' by the: pins L5 engaging in a longitudinal slot 46 in said member.

It is believed that the manner of operation and use of my improved sandpapering machine Will be readily understood from the above description, it being apparent that the rotation of the motor shaft will cause the foot 20 to oscillate and the paper to be gradually fed forward. The pin 34 in the bar 18 striking the right-hand shoulder 35 turns said bar 18 to the left causing arm to press pawl 42 against ratchet wheel advancing sandpaper, and as previously explained also causes with correct timing to release 25, while when said pin strikes the lefthand shoulder 35 it causes bar 32 to turn to the right thereby not turning the wheel therefore not moving the sand paper even though clamping bars release paper as before explained. The user of the machine retains the paper in engagement with surface to be at its other end to the treated, and with the proper degree of pressure by means of the handle 11.

In Fig. 5 of the drawing I have shown a slightly modified form of operative connection between the gear 1 1- and the oscillatory lever. In this modified arrangement the lever, indicated at 18 is tulcrumed between its ends as at while a link 51 is connected at one end to the upper end of the lever and gear 14 eccentrically of the latter. 7

WVhile I have described that my device is operated by a motor, it is understood that with said drums, means for clamping said sandpaper and means for imparting a rotary step by step movement to the said drums as the said lever oscillates, including a rod on tendinglongitudinally through the lover, a

pin projecting from said rod and adapted to engage fixed parts as the lever reaches the ends of its oscillatory movement, an arm projecting from said rod, and an operative connection between said arm and one of said drums, said operative connection comprising a ratchet wheel fixedto said drum, a thrusti bar ada ted to be en a 'ed b said arm, and

a pawl on said thrust oarengagmg said ratchet wheel.

2. A sandpapering machine comprising an electric motor, a lever 'fulcrumed on the motor casing, means. forming an operative connection between the motor shaft and the lever whereby rotation of the said shaft oscillates the said lever, and a sandpaperholding foot on said lever, a pair of drums on said foot, a web of sandpaper engaged with said drums, a pair of clamping elements engaged with said sandpaper to retain the latter fixed on said foot, means'adapted for operation byoscillation ot' said lever for momentarily freeing said clamping bars from said paper, and means for impartingan ad vancing movement to the said drums when the said clamping barsare freed,

r 3. Asandpaperingmaohine comprising an electric motor, a lever fulcrnmed on the'motor casing, means forming an operative connection between themotor shaft and the lever whereby TOlJiLtlOIl ot the said shaft oscil- 'lates the said lever, and a sandpaper h0ld,

ing foot on said lever, a pair of drums on said foot, a web otsandpaper engaged at its ends wlth said drums and passing'under said foot, a pair of clamping bars holdin said paper rigid on said foot, arod extending longitudinally inthe lever and adapted for turning onits own axis, a pin projecting from said rod and adapted to engage fixed parts to turn the rod as the lever reaches the ends of its oscillatory'movement, a cam on said rod adapted to lift thesaid clamping bars from the sandpaper, springs engaged with said bars and holding the latter in operative position, and an arm projecting from said rod operatively connectedto one of the drums whereby the latter given an advancing movement transmitted also to the other of said drums bythe intervening paper,

timed to take place whensaid cam liftssaid clamping rods.

In testimony whereof. I have affixed my signature. i 1

LOUIS FERRARA. 

